linux-kernel - Re: [PATCH v5 4/7] PCI: dwc: Add support for ELBI resource mapping

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Message-ID: <aot5wc5fki7f3scvtp56cdxpli65zpnsj4wr5n3zsa4pc2i5un@p6gnu7gqa5gh>
Date: Fri, 28 Mar 2025 17:23:20 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Cc: cros-qcom-dts-watchers@...omium.org, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kw@...ux.com>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	Jingoo Han <jingoohan1@...il.com>, linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, quic_vbadigan@...cinc.com, 
	quic_mrana@...cinc.com, quic_vpernami@...cinc.com, mmareddy@...cinc.com
Subject: Re: [PATCH v5 4/7] PCI: dwc: Add support for ELBI resource mapping

On Sun, Mar 09, 2025 at 11:15:26AM +0530, Krishna Chaitanya Chundru wrote:
> External Local Bus Interface(ELBI) registers are optional registers in
> dwc which has vendor specific registers.

s/dwc which has/DWC IPs having

> 
> As these are part of dwc add the mapping support in dwc itself.
> 

'Since ELBI register space is applicable for all DWC based controllers, move the
resource get code to DWC core and make it optional.'

> Suggested-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

- Mani

> ---
>  drivers/pci/controller/dwc/pcie-designware.c | 9 +++++++++
>  drivers/pci/controller/dwc/pcie-designware.h | 1 +
>  2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index 145e7f579072..874fd31a6079 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -157,6 +157,15 @@ int dw_pcie_get_resources(struct dw_pcie *pci)
>  		}
>  	}
>  
> +	if (!pci->elbi_base) {
> +		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi");
> +		if (res) {
> +			pci->elbi_base = devm_ioremap_resource(pci->dev, res);
> +			if (IS_ERR(pci->elbi_base))
> +				return PTR_ERR(pci->elbi_base);
> +		}
> +	}
> +
>  	/* LLDD is supposed to manually switch the clocks and resets state */
>  	if (dw_pcie_cap_is(pci, REQ_RES)) {
>  		ret = dw_pcie_get_clocks(pci);
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 501d9ddfea16..3248318d3edd 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -443,6 +443,7 @@ struct dw_pcie {
>  	resource_size_t		dbi_phys_addr;
>  	void __iomem		*dbi_base2;
>  	void __iomem		*atu_base;
> +	void __iomem		*elbi_base;
>  	resource_size_t		atu_phys_addr;
>  	size_t			atu_size;
>  	u32			num_ib_windows;
> 
> -- 
> 2.34.1
> 

-- 
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